eth-retry 0.3.0

Provides a decorator that automatically catches known transient exceptions that are common in the Ethereum/EVM ecosystem and reattempts to evaluate your decorated function

eth_retry

Stop transient errors from wasting your time!

eth_retry is a Python library that provides one decorator, eth_retry.auto_retry.

auto_retry will automatically catch known transient exceptions that are common in the Ethereum/EVM ecosystem and will reattempt to evaluate your decorated function up to os.environ['MAX_RETRIES'] (default: 10) times.

Supports both synchronous and asynchronous functions.

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Covers many common transient errors in the EVM ecosystem, including:

• RPC timeouts
• Block explorer API rate-limiting
• Generic exceptions:
  • ConnectionError
  • HTTPError
  • ReadTimeout
  • TimeoutError
• eth-brownie specific errors:
  • sqlite3.OperationalError: database is locked

Installation:

pip install eth_retry or pip install git+https://github.com/BobTheBuidler/eth_retry.git

Usage:

import eth_retry

@eth_retry.auto_retry
def some_function_that_errors_sometimes():
    i = 0
    am = 1
    doing = 2
    stuff = 3
    return stuff

error_free_result = some_function_that_errors_sometimes()

Between attempts, eth_retry will time.sleep for a random period between os.environ['MIN_SLEEP_TIME'] (default: 10) and os.environ['MAX_SLEEP_TIME'] (default: 20) seconds. The period is randomized to help prevent repetitive rate-limiting issues with parallelism by staggering the retries.

On the nth retry, the sleep period is multiplied by n so that the target endpoint can cool off in case of rate-limiting.

After os.environ['MAX_RETRIES'] failures, eth_retry will raise the exception.

Environment:

# Minimum sleep time in seconds. Integer. Defaults to 10.
MIN_SLEEP_TIME=10

# Maximum sleep time in seconds. Integer. Defaults to 20.
MAX_SLEEP_TIME=20

# Maximum number of times to retry. Integer. Defaults to 10.
MAX_RETRIES=10